1 Scope

10.703GPPGSM Adaptive Multi-Rate Speech Codec (AMR)Project schedule and open issues for AMRTS

The purpose of this document is to describe the project schedule, key milestones and open issues for the standardization of the GSM Adaptive Multi-Rate speech codec (AMR). It also lists the new specifications and necessary amendments to the GSM/DCS phase 2+ specifications for the technical realization of the function.

1.1 References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

– References are either specific (identified by date of publication, edition number, version number, etc.) or non‑specific.

– For a specific reference, subsequent revisions do not apply.

– For a non-specific reference, the latest version applies.

– A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number.

[1] “Adaptive Multi Rate (AMR) Study Phase Report”, version 1.0, Tdoc SMG 740/97, ETSI SMG#23 meeting, Budapest, Hungary, 13-17, October 1997.

[2] “AMR, the way forward”, Tdoc SMG 860/97, Source: SMG11 Chairman, ETSI SMG#23 meeting, Budapest, Hungary, 13-17, October 1997.

[3] “AMR deliverables”, Tdoc SMG11 264/97, Source: SMG11, ETSI SMG11#4 meeting, Bad Aibling, Germany, November 17th – 21st, 1997

[4] AMR permanent document AMR-1, Project Overview, version 0.3, Tdoc SMG11 AMR 109/98, ETSI SMG11#6&AMR#10 meeting, Stockholm, Sweden, 3-12 June, 1998

[5] AMR permanent document AMR-2, Project plan, version 0.1, Tdoc SMG11 AMR 49/98, ETSI SMG11 AMR#9 meeting, Versailles, France, 23-25 March, 1998

[6] AMR permanent document AMR-3b, Performance requirements, version 1.0, Tdoc SMG11 125/98, ETSI SMG11#6bis meeting, Tampere, Finland, 28-30 July, 1998

[7] AMR permanent document AMR-4a, Selection rules for Qualification Phase version 1.0, Tdoc SMG11 AMR 64/98, ETSI SMG11 AMR#9 meeting, Versailles, France, 23-25 March, 1998

[8] AMR permanent document AMR-4b, Selection rules for Selection Phase, version 1.0, Tdoc SMG11 133/98, ETSI SMG11#6bis meeting, Tampere, Finland, 28-30 July, 1998

[9] AMR permanent document AMR-5, Design constraints, version 1.2, Tdoc SMG11 80/98, ETSI SMG11#6 meeting, Stockholm, Sweden, 3-12 June, 1998

[10] AMR permanent document AMR-6, Radio simulator version 0.1, Tdoc SMG11 AMR 57/98, ETSI SMG11 AMR#9 meeting, Versailles, France, 23-25 March, 1998

[11] AMR permanent document AMR-7a, Test plans for Qualification Phase version 1.0, Tdoc SMG11 AMR 73/98, ETSI SMG11 AMR#9 meeting, Versailles, France, 23-25 March, 1998

[12] AMR permanent document AMR-7b, Test plans for Selection Phase, version 1.5, Tdoc SMG11 132/98Rev5, ETSI SMG11#6bis meeting, Tampere, Finland, 28-30 July, 1998

[13] AMR permanent document AMR-8, System simulator for the AMR development, , version 1.0, Tdoc SMG11 126/98, ETSI SMG11#6bis meeting, Tampere, Finland, 28-30 July, 1998

[14] AMR permanent document AMR-9, Complexity and delay assessment, version 1.3, Tdoc SMG11 136/98Rev, ETSI SMG11#6bis meeting, Tampere, Finland, 28-30 July, 1998

[15] AMR permanent document AMR-12a, Qualification deliverables, version 1.2, Tdoc SMG11 AMR 61/98Rev3, ETSI SMG11 AMR#9 meeting, Versailles, France, 23-25 March, 1998

[16] AMR permanent document AMR-12b, Selection deliverables, version 1.0, Tdoc SMG11 134/98Rev3, ETSI SMG11#6bis meeting, Tampere, Finland, 28-30 July, 1998

[17] AMR permanent document AMR-13b, Processing functions for AMR qualification tests, version 0.5, Tdoc SMG11 AMR 51/98Rev3, ETSI SMG11 AMR#9 meeting, Versailles, France, 23-25 March, 1998

[18] AMR permanent document AMR-13b, Processing functions for AMR selection tests, version 1.2, Tdoc SMG11 131/98Rev2, ETSI SMG11#6bis meeting, Tampere, Finland, 28-30 July, 1998

[19] Results of AMR Qualification Phase”, Tdoc SMG 368/98, Source: SMG11 and AMR Chairmen, ETSI SMG#26 meeting, Helsinki, Finland, 22-26, June 1998.

[20]: Revision to AMR Performance requirements, Tdoc SMG 369/98, Source: SMG11, ETSI SMG#26 meeting, Helsinki, Finland, 22-26, June 1998.

[21]: Results of AMR Selection Phase, Tdoc SMG 562/98, Source SMG11, ETSI SMG#27 meeting, Prague, Czech Republic, October 12-16, 1998.

1.2 Abbreviations

ACR Absolute Category Rating

AMR Adaptive Multi-Rate

C/I Carrier-to-Interferer ratio

CNG Comfort Noise Generation

DCR Degradation Category Rating

DEC Dynamic Error Condition

DSP Digital Signal Processor

DTMF Dual Tone Multi Frequency

DTX Discontinuous Transmission for power consumption and interference reduction

ECx Error Condition at x dB C/I

EFR Enhanced Full Rate

EID Error Insertion Device

ETSI European Telecommunications Standards Institute

FR Full-rate channel or original GSM Full Rate speech codec

FH Frequency Hopping

G.726 ITU 16kbs/24kbs/32kbs ADPCM codec

G.728 ITU 16kbs LD-CELP codec

G.729 ITU 8kbps speech codec

GSM Global System for Mobile communications

HR Half-rate channel or GSM Half Rate speech codec

IRS Intermediate Reference System, No IRS= rather flat

ITU-T International Telecommunication Union
Telecommunications Standardization Sector

MNRU Modulated Noise Reference Unit

MOS Mean Opinion Score

MS Mobile Station

OVL Overload point

PCM Pulse Code Modulation

Q Speech-to-speech correlated noise power ratio in dB

qdu quantization distortion unit

RPE-LTP Regular Pulse Excited codec with Long Term Prediction

SID Silence Descriptor

SMG Special Mobile Group

SNR Signal to Noise Ratio

TCH-HS Traffic CHannel Half rate Speech

TCH-FS Traffic CHannel Full rate Speech

TDMA Time Division Multiple Access

TFO Tandem Free Operation

UPCM Uniform or Linear PCM

VAD Voice Activity Detector

Error Patterns (EP0, EP1, EP2 and EP3):

– EP0 without channel errors;

– EP1 C/I=10 dB; 5 % Gross BER (well inside a cell); TU3, Ideal Frequency Hopping

– EP2 C/I= 7 dB; 8 % Gross BER (at a cell boundary);

– EP3 C/I= 4 dB; 13 % Gross BER (outside a cell).

1.3 Support of specification work

This document is a ‘living document’ permanently updated by PT SMG & SMG11. Proposals for change shall be forwarded to PT SMG (contact name and mailing information listed on the last page). The latest version of this document can be obtained from the same source. The AMR specification rapporteurs should make sure that this document always reflects the latest status of work.

Specification and Change Request rapporteurs should ensure that the latest versions of their material is made available for review and comment by the following mechanisms:

ETSI FTP Server (docboc.etsi.fr or docbox.etsi.org):

in /Tech-Org/smg/Document/smg11/smg11_amr/

• All new AMR specifications.

• All AMR meeting reports, most input and all output documents from all AMR ad-hoc.

in /Tech-Org/smg/Document/smg11/smg11_amr/CR/

• All change requests to the existing specifications.

Email distribution list:

SMG2SMG11AMR@list.etsi.fr